docs: def suggest_implied_attributes(prj):
      """
      If given project contains what could be implied attributes, suggest that.
  
      :param Iterable prj: Intent is a Project, but this could be any iterable
          of strings to check for suitability of declaration as implied attr
      :return list[str]: (likely empty) list of warning messages about project
          config keys that could be implied attributes
      """
      def suggest(key):
          return "To declare {}, consider using {}".format(
              key, IMPLICATIONS_DECLARATION)
      return [suggest(k) for k in prj if k in IDEALLY_IMPLIED]